feat: Enhance dose history parsing and add unit tests for improved functionality

tests/test_dose_parsing.py

@@ -0,0 +1,51 @@
+import pytest
+from datetime import datetime
+import tkinter as tk
+from src.ui_manager import UIManager
+
+@pytest.fixture
+def root_window():
+    root = tk.Tk()
+    yield root
+    root.destroy()
+
+@pytest.fixture
+def ui_manager(root_window):
+    class DummyLogger:
+        def debug(self, *a, **k): pass
+        def warning(self, *a, **k): pass
+        def error(self, *a, **k): pass
+    return UIManager(root_window, DummyLogger())
+
+def test_parse_dose_history_for_saving_bullet_and_delete(ui_manager):
+    # Simulate user editing: add, delete, and custom lines
+    date_str = "07/30/2025"
+    # User deletes one line, adds a custom one
+    text = """
+• 09:00 AM - 150mg
+• 06:00 PM - 150mg
+Custom note
+""".strip()
+    result = ui_manager._parse_dose_history_for_saving(text, date_str)
+    # Should parse both bullets and keep the custom line
+    assert "2025-07-30 09:00:00:150mg" in result
+    assert "2025-07-30 18:00:00:150mg" in result
+    assert "Custom note" in result
+    # If user deletes all, should return empty string
+    assert ui_manager._parse_dose_history_for_saving("", date_str) == ""
+    assert ui_manager._parse_dose_history_for_saving("No doses recorded today", date_str) == ""
+
+def test_parse_dose_history_for_saving_simple_time(ui_manager):
+    date_str = "07/30/2025"
+    text = "09:00 150mg\n18:00 150mg"
+    result = ui_manager._parse_dose_history_for_saving(text, date_str)
+    assert "2025-07-30 09:00:00:150mg" in result
+    assert "2025-07-30 18:00:00:150mg" in result
+
+def test_parse_dose_history_for_saving_mixed(ui_manager):
+    date_str = "07/30/2025"
+    text = "• 09:00 AM - 150mg\n18:00 150mg\nJust a note"
+    result = ui_manager._parse_dose_history_for_saving(text, date_str)
+    assert "2025-07-30 09:00:00:150mg" in result
+    assert "2025-07-30 18:00:00:150mg" in result
+    assert "Just a note" in result